Improvement in the manufacture of bricks



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EDWARD L. SEYMOUR, OF' YORK, N. Y.

Letters Patent .No. 71,229,.zaeeez1veeemeee- 19, 1867.

IMPROVEMENT IN THE MANUFAG'TURE Ol BRIGKSyRETORTS, MUFFLES, GRUGIBLES, ac.

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TO ALL WHOM IT MAY CONCERN:

Be it k'tOWll that I, EDWARD L. SEYMOUR, of the city, county, and State of New York, have invented an improved Method of Manufacturing Bricks, Retorts, Mufiies, Grucibles, and other Fire-Proof Materials for metallurgical and chemical purposes, of which the following is a trueand correct description.

Lime, magnesia, pure clay, talc, and other silicates of magnesia, are infusible (at the greatest heat that can be produced in our usual furnaces) when alone; but, in combination with each other, and particularly in the presence of metallic oxides and of alkalies, they vitrit'y and fuse readily, one of the-greatest difficulties metallurgy has to cope with. To meet this diificulty inthe manufacture of fire-proof vessels and materials, such as crucibles, retort s, mufiies, bricks, slabs, &c., I make use of emery, which substance, particularly when finely pulverized and freed from metallic oxides and earthy impurities, can be exposed to the strongest white heat of our usual smelting furnaces, in contact with metallic'oxides, with al kalies and silicates of any description, without fusing or thoroughly vitrifying. To form it into a plastic paste or mass, I mix it intimately with a sufiicient quantity of pure hydrated alumina in combination with'albumen, of borate of alumina, of bora-te of soda and alumina, or of pure silicate of alumina. The latter, being the most economical, answers almost every purpose as'a binding or agglutinatingmenstruum, with emery as a basis.

What I claim as my invention, and desire to secure by Letters Patent, is-I e The employment of pulverized emery, in combination with any one or more of the materials aforenamed, for the purpose specified.

E. L. SEYMOUR.

Witnesses:

J. B. HYDE,

CHARLES WRIGHT. 

